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If the diameter of a circle is 7 cm, then what will be its circumference (in cm)?
Radius of circle = $$r=\frac{7}{2}=3.5$$ cm
=> Circumference = $$2\pi r$$
= $$2\times\frac{22}{7}\times3.5$$
= $$44\times0.5=22$$ cm
=> Ans - (B)
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